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IMPORTANT
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Two black bodies A and B have equal surface areas and are maintained at temperatures 27 °C and 177 °C, respectively. What will be the ratio of the thermal energy radiated per second by A to that by B?

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Important Questions on Thermometry, Thermal Expansion and Kinetic Theory of Gases

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JEE Main
IMPORTANT
A faulty thermometer has its fixed points marked 5 and 95. If the temperature of a body as shown on the Celsius scale is 40, then its temperature shown on this faulty thermometer is
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JEE Main
IMPORTANT
A steel rod of diameter 1 cm is clamped firmly at each end when its temperature is 25 °C so that it cannot contract on cooling. The tension in the rod at 0 °C is approximately α=10-5 °C-1, Y=2×1011 N m-2,
EASY
JEE Main
IMPORTANT
The temperature of a physical pendulum whose time period is T is raised by Δθ. The change in its time period is,
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JEE Main
IMPORTANT
On heating, a liquid having coefficient of volume expansion α in a container having coefficient of linear expansion α2, the level of the liquid in the container would,
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JEE Main
IMPORTANT
Two rods of lengths l1 and l2 are made of materials whose coefficient of linear expansions are α1 and α2, respectively. If the difference between two lengths is independent of temperature, then,
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JEE Main
IMPORTANT
If two rods of lengths L and 2L having coefficient of linear expansion α and 2α, respectively, are connected end-on-end, the average coefficient of linear expansion of the composite rod equals,
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JEE Main
IMPORTANT
A solid ball of metal has a spherical cavity inside it. If the ball is heated, the volume of the cavity will,